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Machines
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Friction and Lubrication of Rolling Element Bearings
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Friction and Lubrication of Rolling Element Bearings

A special issue of Machines (ISSN 2075-1702). This special issue belongs to the section "Friction and Tribology".

Deadline for manuscript submissions: closed (30 June 2023) | Viewed by 3230

Special Issue Editors

Dr. Mahdi Mohammadpour

E-Mail Website
Guest Editor
School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Loughborough LE11 3TU, UK
Interests: applied tribology; computational tribology; dynamics; NVH; powertrain
Dr. Ehsan Fatourehchi

E-Mail Website
Guest Editor
Scania CV AB, SE-151 87 Södertälje, Sweden
Interests: tribology; rolling contact fatigue; elastohydrodynamic lubrication (EHL); root cause failure analysis; rolling bearing wear

Special Issue Information

Dear Colleagues,

Roller element bearings play a vital role in most engineering applications. The current shift towards sustainability and green energy add more challenges to the tribology of rolling bearings. This list of challenges is extensive and includes harsh lubrication conditions of roller bearings in wind turbines with frequent start–stops or electric discharge machining (EDM) in EV applications. This necessitates the demand for more efficient and reliable rolling element bearings, covering a variety of aspects, including geometric optimization, as well as lubricant and material properties.

The advances in simulations and testing tools aids the development of more accurate and efficient predictive methods. This Special Issue aims to provide the latest research and developments in the field of rolling element bearing tribology. We invite submissions from both academic and industrial colleagues to form a comprehensive collection of research in this field.

Dr. Mahdi Mohammadpour
Dr. Ehsan Fatourehchi
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Machines is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • roller element bearings
  • tribology
  • lubrication
  • friction
  • elastohydrodynamics
  • EHL
  • Contact mechanics
  • dynamics
  • wear
  • rolling contact fatigue

Published Papers (2 papers)

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Research

22 pages, 5980 KiB  
Article
Experimental Analysis of Rolling Torque and Thermal Inlet Shear Heating in Tapered Roller Bearings
by Manjunath Manjunath, Dieter Fauconnier, Wouter Ost and Patrick De Baets
Machines 2023, 11(8), 801; https://doi.org/10.3390/machines11080801 - 03 Aug 2023
Cited by 1 | Viewed by 1132
Abstract
The investigation in this article focuses on the rolling resistance torque and thermal inlet shear factor in tapered roller bearings (TRBs) through systematic experiments using a modular test setup. TRBs typically operate under Elastohydrodynamic Lubrication (EHL) conditions. At sufficiently high speeds, the majority [...] Read more.
The investigation in this article focuses on the rolling resistance torque and thermal inlet shear factor in tapered roller bearings (TRBs) through systematic experiments using a modular test setup. TRBs typically operate under Elastohydrodynamic Lubrication (EHL) conditions. At sufficiently high speeds, the majority of rolling friction is due to a significant shift of the pressure centre in the EHL contact. While at lower speeds, sliding friction in the roller-rib contact becomes dominant, which operates under mixed lubrication conditions. Limited literature exists on the impact of inlet shear heating on effective lubricant temperature (Tin_c) and rolling friction in TRBs. To fill this gap, experimental measurements of the total frictional torque under axial loading at different speeds and oil temperatures are performed. With existing models for different friction contributions described in the literature, the rolling resistance due to EHL has been determined for various operating conditions. The effects of dimension-less speed (U), material (G), and load (W) parameters have also been investigated. Under fully flooded conditions, it was observed that the influence of material (G) and load (W) parameters on rolling friction is minor, while the impact of velocity (U) is significant. In the context of rolling resistance, the heating due to shear of the lubricant in the inlet zone plays a significant role. For higher rotational velocities, the estimated rotational torque reduction resulting from inlet shear heating was found to be approximately 6–8%. Full article
(This article belongs to the Special Issue Friction and Lubrication of Rolling Element Bearings)
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18 pages, 5911 KiB  
Article
Tribodynamic Modelling of High-Speed Rolling Element Bearings in Flexible Multi-Body Environments
by Harry Questa, Mahdi Mohammadpour, Stephanos Theodossiades, Colin P. Garner, Stephen R. Bewsher and Günter Offner
Machines 2023, 11(1), 93; https://doi.org/10.3390/machines11010093 - 11 Jan 2023
Viewed by 1496
Abstract
This study presents a new flexible dynamic model for drive systems comprising lubricated bearings operating under conditions representative of electrified vehicle powertrains. The multi-physics approach importantly accounts for the tribological phenomena at the roller–race conjunction and models their effect on shaft-bearing system dynamics. [...] Read more.
This study presents a new flexible dynamic model for drive systems comprising lubricated bearings operating under conditions representative of electrified vehicle powertrains. The multi-physics approach importantly accounts for the tribological phenomena at the roller–race conjunction and models their effect on shaft-bearing system dynamics. This is achieved by embedding a non-linear lubricated bearing model within a flexible system level model; this is something which has not, to the authors’ knowledge, been reported on hitherto. The elastohydrodynamic (EHL) film is shown to increase contact deflection, leading to increased contact forces and total bearing stiffness as rotational speeds increase. Results show that for a 68 Nm hub motor operating up to 21,000 rpm, the input bearing EHL film reaches a thickness of 4.15 μm. The lubricant entrainment increases the roller–race contact deflection, causing the contact stiffness to increase non-linearly with speed. The contribution of the lubricant film leads to a 16.6% greater bearing stiffness at 21,000 rpm when compared to conventional dry-bearing modelling methods used in current multi-body dynamic software. This new methodology leads to more accurate dynamic response of high-speed systems necessary for the next generation of electrified vehicles. Full article
(This article belongs to the Special Issue Friction and Lubrication of Rolling Element Bearings)
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